In large oven safe skillet or casserole dish, brown ground beef, ground sausage, and red onion
Drain excess oil and set to the side
In a medium saucepan, melt butter and slowly sprinkle in flour to create a paste
Add milk slowly to paste to start creating a thick sauce
Once you reached your desired consistency, add in 2 cup of shredded cheese
Pour cheese sauce over meat mixture
Add one layer of Frozen Tater Tots
Top with 2 Cups of shredded cheese
Bake at 375 degrees for 45-60 minutes
Top with all of your favorite hamburger toppings and serve
Done!